Because no one knows which of the study options is best, the patients will be "randomized" into one of the study groups. They will take afatinib by mouth every day for either 3 months (short course) or for 2 years (long course). Randomization means that one is put into a group by chance. It is like flipping a coin. Neither the patient, nor the research doctor will choose what group the patient will be in. You will have a 50/50 chance of being placed in any group.